JPH01213425A - Rayon/polyester blended yarn by air false twist method - Google Patents

Abstract

PURPOSE:To obtain the subject supple blended yarn of liveliness for apparel raw material, by feeding a blended fiber bundle containing rayon fiber at a specific ratio and consisting of polyester fiber and rayon fiber into an air false twist type spinning device in opened state. CONSTITUTION:A blended fiber bundle 2 containing 20-80wt.% rayon fiber based on total amount and consisting of polyester fiber having 100-200mm longest fiber length, <=55mm average fiber length by Barbe method of top analyzer provided according to JIS L 1083-1971 and <=5 denier fineness and rayon fiber having 200mm longest fiber length and >=55mm average fiber length by Barbe method is pulled out of cans 1 and fed in opened state from a front roller 6 of draft device into an air false twist type spinning device consisting of air type yarn turning devices 7 and 9 and false twist providing device 8 which are mutually reverse in rotation direction and spun to provide the aimed blended yarn Y.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to a novel spun yarn made of polyester fiber and rayon fiber, and in particular to a flexible and stiff spun yarn produced by an air false-twisting method. This invention relates to a blended yarn suitable as a clothing material.

(Prior art) After the roving is drafted into a fleece by a drafting device,
This is introduced into an air false twisting device to give a false twist, and while false twisting is applied to the short fiber bundle located in the center, a group of fibers having substantially free ends around the fiber bundle is created. The technology in which the outer unrestricted fiber group is wound around the central fiber bundle during untwisting to form a spun yarn is called the air false-twist spinning method, and is an innovative spinning method that replaces the ring spinning method. Recently, it has been attracting attention as one of the methods, and many inventions and ideas related to this have been disclosed in many documents including Japanese Patent Publication No. 31370.

To explain specifically the structure of the spun yarn obtained by the air false twist spinning method, as described in the above publication, some single fibers of the staple fiber bundle have one end attached to the inner layer of the yarn body. It exists with the other end wrapped around the outer layer of the yarn main body, and each wrapped single fiber is oriented in a constant direction with respect to the length direction of the yarn. In this case, the yarn surface has a rough feel in one direction and a smooth feel in the other direction. Compared to other innovative spinning yarns, this yarn has properties that are relatively similar to yarns obtained by conventional ring spinning, and it is easy to spin as coated yarn or composite yarn (Tokuko Showa). 59-7912), the center of the yarn is essentially untwisted and filled with voids, and has good permeability to processing liquids, so it can be applied to spinning various fibers. As much research as possible is underway.

[Problem to be solved by the invention]

As a practical machine for carrying out the air false twist spinning method, the "Jet Spinner for Materials" (abbreviated as MJS) by Murata Kikai Co., Ltd. is currently on the market, but this machine can spin cotton fibers with a relatively short fiber length. This was developed as the main target, and there are still many problems to be solved in spinning yarn containing long fibers, which is the target of the present invention.

In other words, since rayon and polyester staples for long fiber spinning are composed of fibers with fiber lengths distributed over a wide range from 10 m to 250 m, they were developed for cotton fibers with relatively high fiber length uniformity. Even if a fiber bundle containing rayon fibers is directly attached to MJS, good spinning conditions and yarn properties cannot be expected. As an expedient method, a method has been proposed in which these fibers are cut to resemble the fiber length distribution of cotton fibers and then spun, but this naturally results in the appearance and texture peculiar to long fiber spun yarns. It is damaged and undesirable. This is a fatal flaw in the case of silk-like materials, which are known for their elegance.

Furthermore, as schematically shown in Figure 1, the yarn obtained by air false-twisting has a structure different from that obtained by ring spinning, and has substantially no real twist. Most of the strength of the yarn depends on the outer layer fibers wrapped around the inner layer fiber bundle, so when the number of constituent fibers in the cross section of the yarn is the same, the yarn strength is higher than that of ring-spun yarn. It is natural that the power is low.

The present invention eliminates these drawbacks, can be manufactured by maintaining good spinning condition by air false twist spinning method, and has the unique flexibility of rayon fiber as well as a stiff texture. The purpose of the present invention is to provide a novel yarn by blending long fiber staples.

[Means to solve the problem]

That is, in the present invention, a blended fiber bundle consisting of polyester fibers and rayon fibers containing rayon at a ratio of 20 to 80% by weight based on the total amount is moved from a front roller of a drafting device in an opened state in the direction of rotation. The yarn is obtained by being supplied to an air false twisting spinning device consisting of an air yarn turning device and a false twisting device that are oriented in opposite directions, and the polyester fiber has a longest fiber length of 100 mm to 200 mm or less, according to JIS
The average fiber length measured by the bar method using a top analyzer specified in L 1083-1971 is 55 or more, and the fineness of the single fiber is 5 denier or less, while the longest fiber length of the rayon fiber is 200 m or less, and the barbé method is used. It is a blended yarn characterized by having an average fiber length of 55 m or more.

In the present invention, in order to obtain the target blended yarn, polyester fibers and rayon fibers having a specific fiber length and/or fineness are combined in a predetermined ratio, and when the fibers are set in an air false-twisting type spinning device as described below. Furthermore, by using a hollow roller as a drafting means, high quality yarn can be effectively spun without damaging polyester and rayon fibers having long fiber lengths.

In the present invention, if the amount of rayon fibers is less than 20% of the total fiber amount, flexibility will be insufficient and it will be unsuitable for the intended silk-like clothing material. On the contrary, 80%
If this value is exceeded, the vIi knitted fabric will lack tension, which is a characteristic of polyester fibers.

The polyester fibers used in the present invention include, in addition to the so-called standard regular type, those with added value such as flame retardant, special ones with improved dyeability, and those with composite structure. However, each is selected according to its use and purpose.

Polyester Staples, which are suitable for mixing with rayon, are cut by cutting to the toe consisting of continuous long fiber bundles by cutting a cut -out device such as toilakta and forming it into a sliver, and is cut into a predetermined or biased in advance. Although any method of converting a staple into a sliver through a carding process can be adopted, the one obtained by the tension cutting method is more suitable for the purpose of the present invention since the fibers have excellent parallelism. The fiber length distribution requires that the longest fiber length is in the range of 100 mm to 200 mm, and the average fiber length by barbé method is 55 mm or more, and those that meet this condition are the rayon fibers described below. When blended, it is possible to maintain a good spinning condition.

In particular, the fineness of the fibers must be as fine as 5 deniers or less; if the fibers are thicker than this, the number of constituent fibers of the spun yarn will be too small and the strength of the yarn will be insufficient.

The rayon fiber used is a sliver obtained by setting staples cut to equal length or bias cut to a fiber length roughly similar to that of the polyester fiber to be blended with the rayon fiber onto a card. Then, together with the polyester fiber sliver, it is set up in parallel in the pre-spinning process of the worsted spinning type and blended, formed into a roving, and supplied to the air false twisting type spinning device.

A plurality of single yarns, for example two single yarns, obtained from an air false-twisting spinning device are pulled together and heated by a known method to form double yarns, which are used as warp or weft yarns for textiles or yarns for knitting.

The yarn produced in this way has both the supple feel of the blended rayon fibers and the supple feel of the rough surface characteristic of the yarn obtained by air false-twisting, while at the same time The fiber has a firm texture, and clothing made using it is rich in elegance and does not wrinkle easily, making it a product suitable for women. This allows us to enter this field as a new material and greatly contributes to expanding the uses of yarn obtained by air false twist spinning.

The production of yarn according to the present invention will be explained based on a preferred example shown in the drawings.

As shown in FIG. 2, a pair of back rollers 3, a pair of middle rollers 5 having an apron 4, a pair of front rollers The fleece-like material was sequentially passed through a draft mechanism consisting of 6 types of
Air swirl nozzle 7, untwisted pipe 8, second air swirl nozzle 9,
The single yarn Y having the above-mentioned unique structure is formed by passing through a pull-out roller 1O, and is wound up as a package 11.

In order to obtain the yarn of the present invention, a hollow roller 13 having a structure as shown in FIG. 4 is specially adopted as the top roller of the middle roller pair 5 of the draft mechanism 12 shown in FIG.
It is configured to smoothly draft polyester fibers and rayon fibers of a specific length. This hollow roller 13 is manufactured to have a small diameter in the central region of its outer peripheral surface, thereby forming a hollow portion 14 of an appropriate depth.

The depth of the hollow part 14 is selected depending on the count of the roving to be supplied, and it is desirable to make it deep for thick roving.
For example, when the weight of the roving is 0.4 to 2.0 g/m, approximately 0.4 to 0.8 g/m is appropriate.

The function of this hollow roller 13 is that if there are fibers in the roving that are longer than the roller gauge set in the draft mechanism (this is not the case with fibers in a sliver prepared with a tension cutting device). However, it is necessary to control the fibers so that they are not cut during drafting and do not disturb the drafting of other fiber groups.

The features of the yarn of the present invention detailed above will become clearer from the following examples.

Example 1 A polyester fiber tow consisting of a bundle of multiple filaments with a single fiber fineness of 1.4 denier was placed in a tow reactor, and 50% by weight of a sliver with an average fiber length of 70 and a single fiber with a fineness of 3 denier were added. A sliver of 50% by weight was obtained by bias-cutting rayon fibers into 76 mm staples and attaching them to a card.
It was blended in the pre-spinning process of worsted spinning to form a 1.4 meter count roving.

This was placed in an air false twist spinning device shown in FIG. 2 to produce a single yarn with a count of 84 meters. The roller gauge of the draft mechanism is set to 103mm between front and middle, and 107mm between middle and pack, and the total draft is 6.
It was 0 times. Also, the depth of the hollow part of the hollow roller is 0.
．． 6 It was Noh.

On the other hand, a control yarn was obtained using the same raw material using the ring spinning method.

Table 1 shows the results of comparing the physical properties of two yarns of the present invention and a control yarn, each of which was made into a double yarn. According to this, it can be seen that although the yarn of the present invention is slightly inferior in physical properties to the control product, it does not pose a problem in practical use.

Table 1 Item Inventive yarn Control high breaking strength (g) 544 635 Breaking elongation (%)
17.4 15.0 Raster U% 11.
3 11. lTh1n (-50χ)98 Thick (+50χ) 12 7Neps
(+200χ)24 30 Fabrics were made using these yarns, and the textures were compared using the KES method. Table 2 shows the results. According to this, it can be seen that the yarn of the present invention has a superior feel compared to the ring-spun yarn.

Items in Table 2 Inventive yarn Control product Flexibility 3.8 3.5 Waist 3.2 3.0 Example 2 Single fiber polyester fiber with a fineness of 2.5 denier was bias-cut to create a fiber length of 76 dragon staples. 35% by weight of the sliver obtained by attaching this to a card, and a staple of 70 dragon length cut by cutting equal lengths of monofilament rayon fiber with a fineness of 2 denier to a card. Both slivers were blended at 65% by weight in a pre-worsted spinning process to form a 0.87 meter count yarn.

This was installed in the above-mentioned spinning apparatus and a single yarn with a count of 52 meters was produced under the same conditions as in Example 1.

The results of comparing this yarn with the same ring-spun yarn are shown in Table 3, as in Example 1 above.

Table 3 Item Inventive yarn Control high breaking strength (g) 450 500 Breaking elongation (%
) 12.2 9.9 Raster U% 9
．． 8' 9.9Thin (-50χ)46 Thick (+50χ) 7
4Neps (+200ri 5
0 40 [Effects of the Invention] According to the present invention, by combining a unique fiber structure and an air false-twisting spinning device, a polyester/
To provide a rayon blended yarn, which is a suitable material for manufacturing women's clothing with excellent flexibility and waist, and to contribute to expanding the uses of yarn obtained by air false-twisting. becomes possible.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing the shape and structure of the single yarn used in the present invention, and Fig. 2 is a side view schematically showing the air passage type spinning device used to manufacture the yarn shown in Fig. 1. , FIG. 3 is a perspective view showing the main parts of the device shown in FIG. Apron, 5-G)'' pair of rollers, 6-pair of front rollers, 7-first air swirl nozzle, 8-untwisting tube, 9-second air swirl nozzle, 10
--1 drawer roller, 11--package, 12--draft mechanism,
13-hollow roller, 14-hollow portion.

Claims (1)

[Claims] 1. A blended fiber bundle consisting of polyester fibers and rayon fibers containing rayon fibers at a ratio of 20 to 80% by weight based on the total amount is rotated in opposite directions from the front roller of a drafting device in an opened state. A yarn obtained by supplying the polyester fiber to an air false twisting spinning device comprising an air yarn turning device and a false twisting device, the polyester fiber has a longest fiber length of 100 mm to 200 mm, and is compliant with JISL1083-
The average fiber length according to the Barbe method of the top analyzer specified in 1971 is 55 mm or more, and the fineness of the single fiber is 5 denier or less, while the longest fiber length of the rayon fiber is 200 mm, and the average fiber length according to the Barbe method is 55 mm.
A blended yarn characterized by the above.